A new route is outlined for preparation of vinyl 1,2-diketones via a three-step sequence. First, allylic alcohols are photooxidized by O-2 to hydroperoxides, which are reduced to vinyl 1,2-diols. These vinyl 1,2-diols are oxidized to vinyl 1,2-diketones with oxoammonium salts, which are prepared in situ from organic nitroxyl radicals. The new route is short, avoids the use of protecting groups, and is generally applicable to obtain aliphatic or aromatic vinyl 1,2-diketones. (C) 2004 Published by Elsevier Ltd.
A new route is outlined for preparation of vinyl 1,2-diketones via a three-step sequence. First, allylic alcohols are photooxidized by O-2 to hydroperoxides, which are reduced to vinyl 1,2-diols. These vinyl 1,2-diols are oxidized to vinyl 1,2-diketones with oxoammonium salts, which are prepared in situ from organic nitroxyl radicals. The new route is short, avoids the use of protecting groups, and is generally applicable to obtain aliphatic or aromatic vinyl 1,2-diketones. (C) 2004 Published by Elsevier Ltd.
Stereoselective Synthesis of γ-Substituted (<i>Z</i>)-Allylic Boranes via Kinetically Controlled Hydroboration of Allenes with 10-TMS-9-borabicyclo[3.3.2]decane
作者:Jeremy Kister、Amy C. DeBaillie、Ricardo Lira、William R. Roush
DOI:10.1021/ja905494c
日期:2009.10.14
Kineticallycontrolled hydroboration of allenes 8 and 14a-d with the readily accessible Soderquist borane 7, which is generated in situ from borohydride 6, constitutes a convenient and preparatively useful method for synthesis of (Z)-gamma-(substituted)allylboranes 9 and 15a-d. These allylboranes undergo highly diastereo- (> or = 90: 10) and enantioselective (typically 89-96% e.e.) allylboration reactions
A stereospecific synthesis of vicinal amino alcohols by aminolysis of vinylepoxides
作者:Ulf M. Lindström、Remi Franckowiak、Nathalie Pinault、Peter Somfai
DOI:10.1016/s0040-4039(97)00224-4
日期:1997.3
Several vinylepoxides have been prepared and subjected to a TsOH·H2O-catalyzed aminolysis reaction to afford the corresponding aminoalcohols in good yields. The nucleophilic addition is stereospecific and proceeds with high regioselectivity at the allylic position, unless other stereoelectronic effects competes. The aminolysis reaction is sensitive to steric hindrance at or in the proximity of the
Metallic indium and zinc readily add to 3-bromopropenyl acetate (5) and benzoate (6) either in THF or in water, affording the corresponding 3-acyloxyallyl organometallic compounds. Nucleophilic addition to aldehydes opens a route to alk-1-ene-3,4-diols 2 in good to excellent yields. Two synthetic protocols were developed, the former involving indium in THF under Grignard conditions and the latter involving zinc in aqueous ammonium chloride under Barbier conditions. The diastereoselectivity, under all the conditions examined, mainly depends on the nature of the carbonyl compound; conjugated aldehydes afford syn adducts 2, while unconjugated aldehydes display the opposite anti stereopreference.
A New Protocol for the Acetoxyallylation of Aldehydes Mediated by Indium in THF
[GRAPHICS]A new precursor of a formal 1-hydroxy allyl anion is represented by 3-bromo-1-acetoxy-1-propene, which is synthesized by the ZnCl2-catalyzed addition of acetyl bromide to propenal. 3-Bromo-1-acetoxy-1-propene reacts with indium powder in THF to give the corresponding 3-acetoxylated ally indium complex, which regioselectively adds to aldehydes, affording monoprotected 1-en-3,4-diols. Diastereoselectivity mainly depends on the nature of the aldehyde; saturated aldehydes afford anti adducts, whereas the alpha,beta -unsaturated aldehydes preferentially lead to the syn isomers.